The subtitle of a book written in the 1970s about these groups is, "America's Epidemic of Sudden Personality Change." (The title is "Snapping.") The authors, Flo Conway and Jim Siegelman, give specific references to est, the precursor to Landmark, which are, I believe, removed from subsequent editions of the book. The "Advanced Course" is probably where the h
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Large Group Awareness Training, "Human Potential"